Plugin: Don't register SIGSEGV and SIGILL handlers
Plugin: Don't register SIGSEGV and SIGILL handlers

The plugin has fault handlers which catch faults and continue.  This
is risky: it is likely to hide bugs in the code during development.
It is also not fail-safe.

Leave the SIGPIPE handler in for now.  It would require different
testing to remove.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=605
TEST=existing tests

Review URL: http://codereview.chromium.org/2935003

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@2689 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client